JP2867660B2 - Casting mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a casting mold capable of simultaneously casting a plurality of products.

(Prior Art) A brake disc of an automobile is manufactured by casting, and a casting mold shown in FIGS. 4 and 5 is conventionally used. That is, reference numeral 1 denotes a casting mold without a mold, which is composed of a first mold 2 and a second mold 3 which are divided into two parts. The first mold 2 is provided with two cavities 4, 4 for casting a brake disc, which are open to the dividing surface 5. And these cavities 4,
The opening 4 is closed by the second mold 3.

A gate 6 is provided on the upper part of the first mold 2, and the gate 6 communicates with the cavities 4, 4 via a runner 7. 8 is introduced into the cavities 4 and 4 via the runner 7.

Therefore, when the molten metal 8 injected into the cavities 4, 4 is cooled and solidified, two brake disks are simultaneously cast.

(Problems to be Solved by the Invention) However, in general, in order to obtain a maximum casting with a single mold and a limited size mold, the cavities 4 are provided close to each other. Cavity 4 and runner 7
Are provided close to each other. However, the cavities 4
When the cavity 4 and the runner 7 are close to each other, the molten metal 8 leaks when the molten metal 8 is injected, and the cavities 4 communicate with each other, or the cavity 4 and the runner 7 communicate with each other. There is a problem that can not be maintained.

Therefore, in order to prevent the molten metal 8 from leaking, it is necessary to design the distance l between the cavities 4 and 4 and the distance l between the cavity 4 and the runner 7 to 20 mm or more. As a result, in the case of a casting mold for casting a brake disk, there is a problem that the number of pieces in one mold is limited, and the number of pieces cannot be increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a casting mold capable of casting a maximum casting even with a single mold and a limited size. Is to do.

[Constitution of the Invention] (Means and Actions for Solving the Problems) In order to achieve the above object, the present invention provides a mold that is divided into two and has a plurality of cavities that are opened on the divided surface, In a casting mold provided with a runner to be introduced into the cavity from the sprue, adjacent cavities or cavities and runners are arranged in a staggered manner around the dividing surface, and the adjacent cavities and the cavity and the runner are arranged. There is that we established road and close.

When the adjacent cavities or the cavities and the runner are arranged in a staggered manner, the cavities and the runners are kept at least at intervals corresponding to the widths of the cavities and the runners, and thus are sufficient to prevent the leakage of the molten metal. Kept at intervals.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 3 show a casting die for casting a brake disk. Reference numeral 11 denotes a mold body of a type without a formwork. The mold body 11 has a first mold 12 and a second mold 12 divided into two parts. Mold
It is composed of 13 and. The first mold 12 has first and third cavities 14, 16 for casting a brake disc.
Are provided on the dividing surface 17 so as to open. In the second mold 13, a second cavity 15 is provided between the first and third cavities 14 and 16 so as to open to the dividing surface 17. The openings of the first and third cavities 14 and 16 are closed by the second mold 13, and the opening of the second cavity 15 is closed by the first mold 12.

Therefore, the first to third cavities 14 to 16 are divided surfaces.
The first cavity 14 and the second cavity 15 are close to each other (for example, when the interval is 2).
~ 3mm). Also, on the upper part of the first mold 12 is a gate 1
8 and the gate 18 is connected to the first through third
The cavities 14-16 communicate with the
, The molten metal 20 is introduced into the cavities 14 to 16 via the runner 19. That is, the runner 19 passes between the second cavity 15 and the third cavity 16 and communicates with the lower portions of the first to third cavities 14 to 16. The cavity 15
However, since the third cavity 16 and the third cavity 16 are the same mold, an interval at which the molten metal 20 does not leak is maintained.

According to the casting mold configured as described above, the periphery of each of the first to third cavities 14, 15, and 16 is an interval corresponding to the width (diameter) of at least one cavity, and the periphery is surrounded by a sand mold. become. Therefore, a cavity is formed that can sufficiently withstand pressure even when pressure is applied to the peripheral wall of the cavity when the molten metal 20 is injected, and leakage of the molten metal 20 can be prevented. Therefore, three brake disks of the conventional size can be simultaneously cast without increasing the size of the mold body 11, and productivity can be improved.

A continuous groove 21 is provided at the lower edge and both side edges of the first mold 12, and the concave groove 21 is fitted at the lower edge and both side edges of the second mold 13. Protrusions 22 are provided to engage when the first mold 12 and the second mold 13 are matched. Therefore, the mold body 11
Of the outer peripheral wall of the first and third cavities 14,1
The distance L between the outer peripheral surface of 6 and the outer peripheral wall of the mold body 11 is conventionally 55 to 6
Although 0 mm was required, according to the present invention, it can be reduced to about 40 mm, and the mold body 11 can be downsized.

In the above-described embodiment, the description has been given of the casting mold for casting the brake disk. However, the present invention is not limited to this, and the present invention can be applied to any casting mold of a casting.

[Effects of the Invention] As described above, according to the present invention, the adjacent cavities or the cavities and the runner are arranged in a staggered manner around the dividing surface of the mold, so that the adjacent cavities and the cavities and the runner are arranged. Can be provided close to each other. Moreover, since the cavities and the runners are maintained at intervals corresponding to at least the widths of the cavities and the runners, they can withstand the pressure of the molten metal and are maintained at a sufficient interval to prevent the leakage of the molten metal. In addition, there is an effect that even a mold having a limited size can cast a maximum amount of a cast product, thereby improving productivity.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional front view of a casting mold cut along a dividing surface, and FIG. 2 is a sectional view taken along line II-II of FIG. Fig. 3 is III in Fig. 1.
FIG. 4 is a vertical sectional front view of a conventional casting mold cut along a dividing plane, and FIG. 5 is a cross-sectional plan view of a part of the casting mold. 11 mold main body, 12 first mold, 13 second mold, 14-16
… Cavity, 17… split surface, 18… gate, 19… runner, 20…
Molten metal.

Claims (1)

(57) [Claims] In a casting mold having a plurality of cavities formed in a divided surface of a divided mold and a runner for introducing molten metal from a sprue into the cavities, the adjacent cavities are provided. Mutual or cavities and runners are arranged in a zigzag with the split surface as the center,
A casting mold characterized in that the adjacent cavities and the cavity and the runner are provided close to each other.